The first thing you may notice are excellent typing, good mixed attacking stats, Download, and decent bulk.

Here are some good and the bad about him:

Good Typing - Bug/Steel is an excellent type combination and will allow Genosekuto to switch into the many powerful Dragon type attacks that plague Ubers.

Excellent Mixed Attacking Stats - 120 in both Attack and Special Attack means that Genosekuto will put a large dent in anything, although his special movepool is superior to his physical movepool.

Download - This is one of the things that stood out to me. With a download boost Genosekuto boasts incredible power, dealing an impressive 61.1%-72.1% to Lugia, assuming 252+ and a Download boost.

Explosion - A powerful attack that will allow him to take out special walls such as the ever annoying Blissey.

Lack of Boosting Moves - This really annoys me about Genosekuto as his only useful boosting move is Rock Polish. No moves that will help him abuse his more useful special movepool.

Barren Physical Movepool - The one thing that stops him from being a viable mixed attacker. Really, his only usable moves would probably be U-turn, X-scissor, and lol quick attack.

99 Base Speed - This is just fail. Genosekuto will be outsped by many things because of one little tiny base point.

There are many better choices for what Genosekuto can do, unfortunately. However, I think that Download will be what helps Genosekuto find his niche in Ubers (or OU if he isn't determined "strong" enough)

And now, discuss!

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Genosect
71 HP | 120 Atk |95 Def | 120 SpA | 95 SpD | 99 Spe

Level-up moves

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New Move Data:
Techno Buster: Base Power 85, 100 Accuracy - Inflicts damage and has no secondary effect. The type of Techno Buster depends on the type of Cassette held by the user, being Normal-type if there is none held, and Electric, Fire, Ice or Water with the appropriate Cassette.

Ability:
Download: Attack is increased when the foe’s Defense is lower than its Special Defense or increases Special Attack when the foe’s Special Defense is lower than its Defense.

The main attack here will obviously be Bug Buzz, receiving stab off of 120 base special attack, bolstered by specs. Genosect also has access to the popular Boltbeam combination. As for the last slot, Explosion is an option as well as Hidden Power Ground to hit things like Heatran and Hihidaruma. A specially-based Life Orb set could also be set up similarly.

Genosect doesn't have much of a physical movepool. A choice of a boosting move, followed by X-Scissor for stab, explosion. He has decent enough special attack to catch something off guard with super effective special attacks.

Claw Sharpen's increase of accuracy allows for a plausible use of Zap-Cannon. The 100% chance of paralysis allows it to outspeed and kill anything faster that cannot kill Genosect in a single hit, as well as being incredibly powerful; 120 base damage coming from 120 base Special Attack is certainly nothing to scoff at. Blizzard abuses the accuracy boost as well, creating a pseudo-boltbeam; and, of course, X-Scissor for physical STAB.

A choice band set could possibly be pulled off with Nitro Charge, U-turn, X-Scissor, and Explosion, but that's just about all of Genosect's physical movepool. Being locked into Nitro Charge is just asking for Heatran or another Flash Fire user to come in, despite its bonuses. Nitro Charge would be better left to something that can abuse it more efficiently. Choice banded U-turning is better left to Scizor as well.

Techno Buster gets no mention at all because I found that it simply ended up being outclassed by the existing moves that Genosect already has access to, Thunderbolt, Ice Beam, and Flamethrower. To use Techno Boost, he must also forgo his Choice item or Life Orb, severely dampening his effectiveness. The only cassette that can even provide anything close to a benefit is the Aqua Cassette. With this item, Techno Buster becomes a water type attack; although, even this is outclassed by Hidden Power, which allows him to keep his item.

Summary:
If one does not play Genosect as a vastly inferior Scizor, he has his own niche to fill. Claw sharpen raising Zap-Cannon's accuracy could prove interesting, though it's mostly theorymonning at this point. Lack of a real physical movepool certainly hurts him, as he only really has X-Scissor to use with his base 120 attack; Earthquake or Stone Edge would have been welcomed.

Of course, being some sort of lovechild between Shockwave and Soundwave doesn't hurt.

Explosion coming off 120 base will hurt ANYTHING that tries to specially wall it and it gets a decent enough special movepool. He also has the ever-helpful Thunder Wave if you wanna punish Base-100 switches. U-Turn is neat, but might not be worth the slot. 71/95/95 is great for a Bug/Steel.

This thing has a huge special movepool and a wide variety of options.
The only problem is that it doesn't seem to be able to do more than 4 moves + life orb. Potentially U-Turn scouting. With impressive 120/120 offensive stats, I can understand Genosect as too powerful for OU, but I could also see it as a regular OU as well.
(Non-serious)
My main question is: how does it get Fly? And how would you use Fly?

Gives enough speed to beat base 95s, and then with the LO and Download boost it can hit pretty hard, and then explode on something threatening. I could see a similar set with Scarf and U-turn. Thunderbolt 2HKOs/OHKOs (with DL boost) most of what resists Bug/Fire, like Heatran, Dragonite, Tentacruel, and the Water/Ghosts. Flamethrower beats steal types, and Explosion beats Blissey. Its speed is a let down too. I want to stick Nitrocharge/RP in there, but I don't want to lose any of those moves really.

Genosekuto is a specially based pokemon although it's base offensive stats are equal. The only Technobooster version that would see use is the Water one, and even that's useless, as Bug Buzz>Surf on Genosekuto.

Personally, I'd love to hear the backstory behind this thing and how it relates to the other legendaries, if it is one.

I think this thing has a TON of potential as a wall breaker. Because of its 120/120 attack stats, and download, its always able to hit its target wall in its lower defensive stat, with a ton of force.

Click to expand...

Though this suggestion may be proved to be true in the future when Generation 5 Pokemon are actually tested, at this point in time, it seems to be quite a unusable idea. Though your fact is true about the Pokemon having amazing base 120 offensive stats, its physical move pool is basically empty of viable moves. This is probably the factor that stops Genosekuto from becoming a viable mixed attacker/ wall breaker.

Since most Ubers Sp.Def is higher than their Defense, he will mostly get Attack boosts, which means he'll have to rely on Bug Opposistion and X-Scissor.. His Special Movepool is really large though, and if you manage to get a special variant in on Groudon you're set.

Sub + 3 Attacks Geno. It should play a lot like SubTran, only with better typing/defenses/speed, but not as much power. Bug Buzz is the primary STAB attack for him, although Flash Cannon is acceptable if you want slightly better coverage (with T-Bolt) at the cost of some power. Leftovers is prefered for Sub recovery, but Life Orb can be used for more power. Toxic slowly wears down counters, while Explosion is for an unexpected boom from behind a sub (just like SubTran). The other possible moves are simply coverage options that are dependant on what you're trying to hit, though running HP Ground is somewhat recommended so you can beat Fire Types.

This set is a major target of Fire types, particularly Shanderaa and Heatran. Running HP Ground allows you to hurt them so long as you have a Sub up, but either way, you're screwed against a Shadow Tag CM Shanderaa.

MS Geno. This is much more gimmicky, but also insanely dangerous, given proper support. This set is pretty self-explanatory, switch into something resisted, Metal Sound the switch-in, then ruin it with a powered up Special Attack.

Geno's speed is unfortunate, but it still outruns a fair portion of the metagame, and can wreak severe havoc with Entry Hazzards backing it up. It really appreciates SR and Spikes, if the former is available. A teammate like Hippowdon, who can set up SR and auto-Sandstorm, is a great ally. Since Geno is just below the speed bracket it would like, T-Wave support can come in handy as well.

EDIT: I also had an xD moment when I realized that the futuristic Bug/Steel thing with a laser cannon on its back is the Paleozoic Pokemon. The Paleozoic Era was about 542 million years ago, according to Wikipedia, so Geno is positively ancient.

Since most Ubers Sp.Def is higher than their Defense, he will mostly get Attack boosts, which means he'll have to rely on Bug Opposistion and X-Scissor.. His Special Movepool is really large though, and if you manage to get a special variant in on Groudon you're set.

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Genosect is one of the few Pokemon that can revenge kill both Swords Dance and Dragon Dance Rayquaza, like Scarf Jirachi. Except Genosect can actually hurt stuff. Unfortunately, it's slower than Salamence....I have this set in mind